import { constantRoutes } from '@/router'
import { getRouters } from '@/api/menu'
import Layout from '@/layout/index'
import ParentView from '@/components/ParentView';

const permission = {
  state: {
    routes: [],
    addRoutes: [],
    defaultRoutes: [],
    topbarRouters: [],
    sidebarRouters: []
  },
  mutations: {
    SET_ROUTES: (state, routes) => {
    state.addRoutes = routes
  state.routes = constantRoutes.concat(routes)
},
SET_DEFAULT_ROUTES: (state, routes) => {
  state.defaultRoutes = constantRoutes.concat(routes)
},
SET_TOPBAR_ROUTES: (state, routes) => {
  // 顶部导航菜单默认添加统计报表栏指向首页
  const index = [{
    path: 'index',
    meta: { title: '统计报表', icon: 'dashboard'}
  }]
  state.topbarRouters = routes.concat(index);
},
SET_SIDEBAR_ROUTERS: (state, routes) => {
  state.sidebarRouters = routes
},
},
actions: {
  // 生成路由
  GenerateRoutes({ commit }) {
    return new Promise(resolve => {
      // 向后端请求路由数据
      getRouters().then(res => {
      const sdata = JSON.parse(JSON.stringify(res.data))
      const rdata = JSON.parse(JSON.stringify(res.data))
      const sidebarRoutes = filterAsyncRouter(sdata)
      const rewriteRoutes = filterAsyncRouter(rdata, false, true)
      rewriteRoutes.push({ path: '*', redirect: '/404', hidden: true })
    commit('SET_ROUTES', rewriteRoutes)
    commit('SET_SIDEBAR_ROUTERS', constantRoutes.concat(sidebarRoutes))
    commit('SET_DEFAULT_ROUTES', sidebarRoutes)
    commit('SET_TOPBAR_ROUTES', sidebarRoutes)
    resolve(rewriteRoutes)
  })
  })
  }
}
}

// 遍历后台传来的路由字符串，转换为组件对象
function filterAsyncRouter(asyncRouterMap, lastRouter = false, type = false) {
  return asyncRouterMap.filter(route => {
    if (type && route.children) {
    route.children = filterChildren(route.children)
  }
  if (route.component) {
    // Layout ParentView 组件特殊处理
    if (route.component === 'Layout') {
      route.component = Layout
    } else if (route.component === 'ParentView') {
      route.component = ParentView
    } else {
      route.component = loadView(route.component)
    }
  }
  if (route.children != null && route.children && route.children.length) {
    route.children = filterAsyncRouter(route.children, route, type)
  } else {
    delete route['children']
    delete route['redirect']
  }
  return true
})
}

function filterChildren(childrenMap, lastRouter = false) {
  var children = []
  childrenMap.forEach((el, index) => {
    if (el.children && el.children.length) {
    if (el.component === 'ParentView') {
      el.children.forEach(c => {
        c.path = el.path + '/' + c.path
      if (c.children && c.children.length) {
        children = children.concat(filterChildren(c.children, c))
        return
      }
      children.push(c)
    })
      return
    }
  }
  if (lastRouter) {
    el.path = lastRouter.path + '/' + el.path
  }
  children = children.concat(el)
})
  return children
}

export const loadView = (view) => { // 路由懒加载
  return (resolve) => require([`@/views/${view}`], resolve)
}

export default permission
